Abstract: A wind turbine with at least one rotor blade and at least one pith drive for turning the at least one rotor blade, the wind turbine comprising a controller which analyses the wind turbine if a first error situation or a second error situation occurs and wherein the controller is adapted to react to the first error situation in absence of a second error situation with a first error procedure, to a second error situation in absence of the first error situation with a second error procedure, and to an error situation where the first error and the second error occur at the same time with a third error procedure that is different to the first error procedure and to the second error procedure.

Abstract: Described and shown is a process for preparing an emergency energy storage device, with at least one energy storage element for operation, whereby the emergency energy store is designed to provide emergency electrical energy for at least one energy consumer, whereby the energy (EL) which can be drawn from the emergency energy storage and/or the peak output (Pmax) which can be drawn from the emergency energy storage is determined and the operational readiness is established as soon as the energy (EL) which can be drawn from the emergency energy storage and/or the peak output (Pmax) which can be drawn from the emergency energy storage has reached a definable minimum energy value. A process for preparing an emergency energy storage device for operation in which the emergency energy storage is discharged via a discharging device and the heat occurring at the internal resistance (Ri) is used to heat the emergency energy storage device.

Abstract: A wind turbine temperature control system for maintaining the temperature of an energy storage device, the temperature control system has a breaking resistor for providing heat to the energy storage device and a power supply for causing a current to flow in the breaking resistor.

Abstract: A wind turbine with pitch motors for pitching rotor blades, further comprises a first sensor unit and a second sensor unit configured to measure at least one of a voltage value and a current value at a first location and a second location, wherein the voltage value and current value are indicative of the condition of a backup power supply. When the second location is different from the first location the measurement results are independent from each other. A comparison of the two measurements then gives a level of confidence how these measurements match each other. In case of a low level of confidence the pitch drive motors are caused to pitch the rotor blades into a feathering position.

Abstract: The present invention provides an electromechanical drive system (1) with at least one electromechanical drive unit (2) to actuate a movable component (3). The electromechanical drive unit (2) comprises a drive unit interface 20 for receiving drive unit control signals (DA), an electromechanical motor (21) controlled by actuation signals (AS) to actuate the component (3), a safety module (4) and a position sensor (5) connected to the safety module via a first data connection (51). The position sensor is adapted to monitor (S1) component (3) and/or motor (21) position and/or speed of the actuated component (3) and/or motor (21); where the safety module (4) is connected to the drive unit interface (20) for receiving the drive unit control signal (DA), and where the safety module is connected to the motor control unit (22) via a third data connection (41) to transmit actuation signals (AS) like actuation speed and desired component position to the motor control unit (22) for actuating (A) the component (3).

Abstract: A method for controlling a wind turbine comprising a first control unit controlling the wind turbine or a part of the wind turbine, the first control unit having a first number of first states. In order to improve the safety integrity level of the wind tur bine, the wind turbine further comprises a second control unit for controlling the first control unit, the second control unit having a second number of second states whereby the number of the second states of the second control unit is lower than the number of the first states of the first control unit. The second control unit maps to each second state a specific states of the number of first states of the first control unit as a target state and allows only a pre-defined set of transitions between the second states of the second control unit.

Abstract: A method for testing the condition of a backup power supply of an axis in a wind turbine, wherein the backup power supply has an associated voltage, the method comprising: electrically isolating the axis of the wind turbine from a grid power supply; discharging the backup power supply for a first period of time at a first predefined current; measuring a first value of the voltage; operating the axis using the backup power supply until the voltage reaches a predefined second value; discharging the backup power supply for a second period of time at a second predefined current; measuring a third value of the voltage; and calculating a parameter based on at least the first and third values, wherein the parameter is characteristic of the condition of the backup power supply.

Abstract: A wind turbine with at least one rotor blade and at least one pith drive for turning the at least one rotor blade, the wind turbine comprising a controller which analyses the wind turbine if a first error situation or a second error situation occurs and wherein the controller is adapted to react to the first error situation in absence of a second error situation with a first error procedure, to a second error situation in absence of the first error situation with a second error procedure, and to an error situation where the first error and the second error occur at the same time with a third error procedure that is different to the first error procedure and to the second error procedure.

Abstract: A method for charging an electric emergency energy storage device (1) comprising the following steps: predicting the energy demand EB of the energy consumer (2), determining the capacitance C of the emergency energy storage device (1) and the internal resistance Ri of the emergency energy storage device (1), calculating a charging voltage UL, whereby the charging voltage UL is calculated in such a way that the energy EC stored in the emergency energy storage device (1) at this charging voltage UL is just enough to meet the predicted energy demand EB, taking into account losses that occur, especially at the internal resistor Ri, and charging or discharging the emergency energy storage device (1) until the calculated charging voltage UL has been reached.

Abstract: Described and shown is a process for preparing an emergency energy storage device, with at least one energy storage element for operation, whereby the emergency energy store is designed to provide emergency electrical energy for at least one energy consumer, whereby the energy (EL) which can be drawn from the emergency energy storage and/or the peak output (Pmax) which can be drawn from the emergency energy storage is determined and the operational readiness is established as soon as the energy (EL) which can be drawn from the emergency energy storage and/or the peak output (Pmax) which can be drawn from the emergency energy storage has reached a definable minimum energy value. A process for preparing an emergency energy storage device for operation in which the emergency energy storage is discharged via a discharging device and the heat occurring at the internal resistance (Ri) is used to heat the emergency energy storage device.